hw/virtio: Use CONFIG_VIRTIO_PCI switch instead of CONFIG_PCI

For downstream s390x builds, we'd like to be able to build QEMU with
CONFIG_VIRTIO_PCI disabled (since virtio-ccw is used here instead),
but still with CONFIG_PCI enabled. This currently fails since the
virtio-*-pci.o files are still included in the build, but virtio-pci.o
is missing. Use the right config switch CONFIG_VIRTIO_PCI to exclude
the virtio-*-pci.o files from the build.
Reported-by: NMiroslav Rezanina <mrezanin@redhat.com>
Signed-off-by: NThomas Huth <thuth@redhat.com>
Reviewed-by: NCornelia Huck <cohuck@redhat.com>
Reviewed-by: NPhilippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: NMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>

hw/virtio/Makefile.objs

@@ -11,7 +11,7 @@ obj-$(call land,$(CONFIG_VIRTIO_CRYPTO),$(CONFIG_VIRTIO_PCI)) += virtio-crypto-p
 
 obj-$(CONFIG_LINUX) += vhost.o vhost-backend.o vhost-user.o
 obj-$(CONFIG_VHOST_VSOCK) += vhost-vsock.o
-ifeq ($(CONFIG_PCI),y)
+ifeq ($(CONFIG_VIRTIO_PCI),y)
 obj-$(CONFIG_VHOST_VSOCK) += vhost-vsock-pci.o
 obj-$(CONFIG_VHOST_USER_BLK) += vhost-user-blk-pci.o
 obj-$(CONFIG_VHOST_USER_SCSI) += vhost-user-scsi-pci.o